/usr/lib/ecl-15.3.7/ecl-quicklisp.asd is in ecl 15.3.7+dfsg1-2+deb9u1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 | (defsystem "ecl-quicklisp" :class asdf::prebuilt-system
:lib #P"SYS:LIBECL-QUICKLISP.A"
:depends-on NIL
:components ((:compiled-file "ecl-quicklisp" :pathname #P"SYS:ECL-QUICKLISP.FAS")))
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